text: 'use strict';
  
  //kata to find lenght a linked lists loop. Given Gaurantee that loop exists.
  
  function loop_size(node){ //eslint-disable-line
    let fast = node.next;
    let slow = node;
    while(slow != fast) {
      slow = slow.next;
      fast = fast.next.next;
    }
    let current = slow.next;
    let counter = 1;
    while(current != slow){
      current = current.next;
      counter += 1;
    }
    return counter
  }
  